Quarter	Billions of US Dollars
1993-07-01	5.011
1993-10-01	4.090
1994-01-01	4.130
1994-04-01	4.220
1994-07-01	3.182
1994-10-01	2.691
1995-01-01	3.238
1995-04-01	3.634
1995-07-01	3.774
1995-10-01	2.135
1996-01-01	2.438
1996-04-01	2.356
1996-07-01	2.218
1996-10-01	2.389
1997-01-01	3.086
1997-04-01	4.637
1997-07-01	6.095
1997-10-01	4.693
1998-01-01	4.115
1998-04-01	4.735
1998-07-01	6.548
1998-10-01	10.432
1999-01-01	12.920
1999-04-01	14.363
1999-07-01	16.137
1999-10-01	13.080
2000-01-01	18.425
2000-04-01	21.475
2000-07-01	18.978
2000-10-01	22.502
2001-01-01	24.760
2001-04-01	26.758
2001-07-01	24.597
2001-10-01	24.377
2002-01-01	19.307
2002-04-01	21.532
2002-07-01	26.211
2002-10-01	28.645
2003-01-01	28.530
2003-04-01	26.617
2003-07-01	27.330
2003-10-01	33.578
2004-01-01	41.107
2004-04-01	37.927
2004-07-01	36.949
2004-10-01	34.696
2005-01-01	39.416
2005-04-01	35.408
2005-07-01	26.240
2005-10-01	28.401
2006-01-01	29.877
2006-04-01	37.680
2006-07-01	30.259
2006-10-01	31.749
2007-01-01	40.726
2007-04-01	42.986
2007-07-01	39.701
2007-10-01	48.777
2008-01-01	63.182
2008-04-01	58.753
2008-07-01	63.094
2008-10-01	60.532
2009-01-01	69.163
2009-04-01	61.478
2009-07-01	72.088
2009-10-01	52.369
2010-01-01	61.848
2010-04-01	48.494
2010-07-01	76.052
2010-10-01	68.140
2011-01-01	69.880
2011-04-01	60.348
2011-07-01	72.726
2011-10-01	74.597
2012-01-01	100.939
2012-04-01	76.097
2012-07-01	61.571
2012-10-01	63.861
2013-01-01	70.579
2013-04-01	59.110
2013-07-01	57.642
2013-10-01	41.721
2014-01-01	44.316
2014-04-01	57.657
2014-07-01	45.404
2014-10-01	41.189
2015-01-01	42.773
2015-04-01	42.727